Air conditioning



R. H. ANDE REGG AIR CONDITIONING Sept. 17, 1935,

3 sheets-sheet 1 Filed Nov. 28, 1934 EVENT??? BY m ATTORNEY Sept. 17,1935. R, H, ANDEREGG 2,014,959

AIR CONDITIONING Filed Nov. 28, 1954 s Sheets-Sheet 2 INVENTOR M 1/ BYmm ATTORNEY Sept. 17,- 1935. R. H. ANDEREGG AIR CONDITIONING Filed NOV.28, 1934 3 Sheets-Sheet 3 iN'vENToR BY ATTORNEY Patented Sept. I7, 1935UNITED STATES, PATENT QFFICE/ AIR CONDITIONING Reuben II. Anderegg, LaCrosse, Wis.

Application November 28, 1934, Serial No. 755,248

11 Claims.

This invention relates to air conditioning, and in particular to asystem designed for cooling the rooms in a large ofiice building.

In the proper air conditioning of a building it 5 is very important thatthe humidity be regulated,

as well as the dry bulb temperature or the superheat in the air.

One of the objects of my invention is a system of air conditioning whichaffords a more economical installation, at the same time giving moreeffective control of the humidity and temperature in individual rooms.One of the problems in the air conditioning of any large buildings isthe varying efiects in the different rooms of sun eflect and occupancyby human beings which cause greater heat additions than otherwise.

Another object of my invention is to control the super-heat in thevarious rooms in-accordance with the amount of cooling required.

Another object of my invention is to first control the humidity of theair to be supplied to the rooms to be conditioned.

Another object is to control the super-heat,

or dry bulb temperature in the rooms to be conditioned. Another objectof my invention is individual room control ofv the superheat. In allcooling and air conditioning there are problems of controlling both drybulb and wet bulb temperatures as both are requisite for comfort.

' In the'applicants invention the problem is first to supply air with adefinite moisture content to the corridors of the building and then tointroduce this air with a definite moisture content into the rooms forfinal conditioning.

Another object of this invention is to supply air with a definitemoisture content and to vary the superheat in accordance with the heatadditions.

For a clearer understanding of the nature and object of the invention,reference is made to the following detailed descriptions, taken inconnection with the drawings shown herewith. In connection therewith, l0represents the individual rooms to be conditioned.

Figure 1 shows a floor plan of one of several floors in a buildingshowing the main air conditioning and the supplemental air conditioner.

Figure 2 is a section of elevation of the building shown in Figure 1.

Figure 3 is an enlarged section of elevation of the main air conditionershown in' Figure 1.

Figure 4 is a section elevation of a supplemental air conditioner shownin Figure 1.

Figure 5 shows a wiring diagram of the conwhich valves are interposedbetween the supnections between the different motors of thesupplementary unit l6.

Figure 6 shows diagrammatically the coils 20 and the connection thereto.

The corridor II in the building connects the 5 room III which is to beconditioned with a main air conditioner I2. In the main air conditioneras shown in Figure 3, l3 represents an outside air inlet and I4 anoutlet to the corridor H. In the main air conditioner, I8 represents afan, I9 a 10 filter, 20 a cooling coil, 2| eliminator plates, 22

. a drip pan, 23 a sewer connection from the drip pan, 31 a pre-coolingcoil, 38 a re-heating coil, 39 and 40 conduits connecting the coils 31and 38. 15

The heat absorbing medium in coils 31 and 38 is circulated throughconduits 39 and 40 by a pump 4|. The refrigerant is conveyed to thecooling coil 20 by a supply pipe 42 and returned from thecooling coil bya pipe 43.

In Figure 6 the cooling coil 20 is shown in more detail as individualcooling coils, designated by the numerals 44, 45, 46 and", which arecontrolled respectively by valves 48, 49, 50 and 5|,

25 ply pipe 42 and the respective coils 44, 45, 46 and 41. The numerals56, 51, 58 and 59 represent electrical or pneumatic conduits connectingthe valves 48, 49, 50 and 5| respectively with thermostats 60, 6|, 62and 63, which are placed in the conduit 64.

52 represents the casing of the main air conditioner l2. Thesupplementary air conditioner is shown at I6 in Figure Land is suppliedwith cold water or a refrigerant by the conduits l5 and 35. 24represents an inside wall abutting the corridor H, in which wall is anopening to the room to be conditioned, ordinarily through a transom 25.The inletfrom the corridor to the supplementary air'conditioner I6 isdesignated by 26. In this inleflis a damper 2'! controlling 40 theamount of air to beadmitted from the corridor into the supplementary airconditioner 16, in which is an air conditioning coil 28, a fan 29, .agrille 30, and an outlet 3| into the room to be conditioned. The fan 29is operated by a motor 45 32. If refrigeration water or medium isfurnished to the coil 28 at less than the dewpoint of the air enteringsaid coil, there will be condensation which is taken away bya connection36 to the sewer.

The damper 21 is composed of blades 65 interconnected by the rod 66 towhich is attached the rod 61, which is attached to similar damper 68composed of blades 69 interconnected by rod 10, which is attached to rod61 in such manner that 55 the movement of the rod 81 will reciprocallyopen and close the dampers 88 and 21 so that when damper 21 is fullyopen, damper 68 will be fully closed, and vice-versa. Also, that damper88 will be in an open position relative to the closed position of damper21, and vice-versa. The motor 1i actuating the movement of the rod 61 isa motor in commercial usage and not herewith particularly described andis so constructed as to stop the movement of the rod 61 when thethermostat is satisfied. This motor 1| is connected with a humidistat 12by means of an electrical circuit 13, and the operation of the dampers21 and 68, in connection with the motor 1i and humidistat 12, is toregulate the proportions of corridor air and recirculated air inaccordance with the humidistat. 33 is a dry bulb thermostat in the rooml0 connected with the motor 32 by the conduit 34 so as to shut off themotor 32 controlling the fan at a' predetermined temperature. Thethermostat 33, also through the conduit 34A, is connected with the motor14 which is the same kind of a motor as operates the dampers 21 and 68.'The motor 14 operates the solenoid valve 15, which is interposed in thecold water conduit l5, and the operation of the solenoid valve ismodulating, and under the influence of the motor 14 will assume adefinite position, either open, closed or intermediate, when thethermostat 33 is satisfied, so that the operation of the valve 15 inconnection with the motor 14 and dry bulb thermostat is to regulate thefiow of refrigerating medium in accordance with the dry bulb thermostat33.

In Figure 5 is shown the wiring connections whereby the motor 32,controlling the fan 29, will continue to operate until both thethermostat 33 and 12 are satisfied. It will be observed that either theclosing of the thermostat 12 or the thermostat 33 will establish aclosing circuit for the motor 32,and in this connection 11 representsthe line in connecting the motor 32 with the motors 1| and 14. 16 is apower line and 18 a ground.

In the operation of the system in the primary air conditioner, air isdrawn from the outside through the inlet l3 and first comes in contactwith the precooler 31, which contains a heat exchange fiuid, thetemperature of which is reguliated by the temperature of the air passingthe reheating coil 38.

This precooled air is then passed through coils 20 which contain arefrigerating medium, the thermostats 68 to 63 controlling the amount ofsuch refrigerant passing through valves 41, 48, 49 and 50 and said coil28, so that the air will emerge from the coil 20 with a definitedewpoint and, therefore, a definite moisture content; The air thenpasses through the re-heating coil 38 containing a heat exchange fiuid,the temperature of which is regulated by the temperature of the airpassing through the coil 31. It is thus apparent that the higher the drybulb air is on entrance to the unit, the higher the dry bulb will be onleaving the re-heating coil 38 due to the higher temperature of the heatexchange fiuid in the coil 38. This is an advantage because the airleaving the coil 38 is emitted into the corridor and the diflerential intemperature between the outside dry bulb temperature and the dry bulbtemperature of the air in the corridor is more nearly kept constant andless liable to heat additions on its travel through the corridor. Inthis connection it is also observed that the reheating work done by thecoil 38 is not extra work for at the same time the other end of thecycle, to-wlt, coil 31, is cooling the incoming air in an amount equalto the reheating by coil 38. This to a certain extent takes the load of!the cooling coils 20, the primary purpose of which is dehumidification.

It will be further observed that the air thus primarily conditionedemits into the corridor with a definite moisture content and at apredetermined difierential in dry bulb temperature between the outsideair and the primarily conditioned air.

After the air has been primarily conditioned and pumped into thedifferent corridors of the building, it becomes available forconditioning the 13 different rooms to be conditioned. The supplementaryair conditioner is located between the room and the corridor, preferablyin the transom, which is usually available and afifords an opportunityfor placing the unit out of the way.

The first problem of the supplementary conditioner is the regulation ofthe humidity which is accomplished by varying the quantity of corridorair which has a low moisture content and the quantity of recirculatedroom air whose :3 moisture content is varied by the conditions which addmoisture to the air, particularly the evaporation of moisture from humanbeings and the presence of water in the room. The corridor air and therecirculated air is mixed and the proportions of the mixture depend uponthe conditions required. The amounts of corridor air and room air mixedtogether is responsive to a humidistat located within the room. Thehumidistat operates by a motor the dampers 21 and 68 in such manner thatwhen the humidistat with a pre-determined setting is satisfied, thedampers assume a definite position and proportion the amount of corridorand room air to be mixed.

Although one specific embodiment of the in- 40 vention has beenparticularly shown and described, it will be understood that theinvention is capable of modification and that changes in theconstruction and in the arrangement of the various co-operating partsmay be made without 45 departing from the spirit or scope of theinvention, as expressed in the following claims.

What I claim is:

1. In an apparatus for air conditioning buildings, the combination of amain air conditioner 50 comprising a casing with an outside air inletand an inside air outlet in communication with a corridor of thebuilding to be conditioned, means to circulate air from said inlet tosaid outlet and through the corridor of the building to be con- 55ditioned, means within said casing in the path of said air to conditionsaid air to a pre-determined dewpoint, means to re-heat said airsubstantially above its pre-determined dewpoint, a supplementary airconditioner comprising a casing, an 60 air inlet in communication withsaid corridor, and air outlet into the room to be conditioned, means tocirculate air from said inlet to outlet, an air conditioning coil insaid casing in the path of said air to extract sensible heat therefrom,and means C3 to regulate the fiow of refrigerant to said coil, saidmeans being responsive to the temperature of the air in said room.

2. In an apparatus for air conditioning buildings, the combination of amain air conditioner 70 comprising a casing with an outside air inletand an inside air outlet in communication with a corridor ol' thebuilding to be conditioned, means to circulate air from said inlet tosaid outlet and through the corridor oi the building to be con- 75ditioned, means within said casing in the path of said 'air to conditionsaid air to a predetermined dewpoint, a supplementary air conditionercomprising a casing, an air inlet in communication with said corridor,an air outlet into the room to be conditioned, means to circulate airfrom said inlet to outlet, an air conditioning coil in said casing inthe path of said air, and means to regulate the flow of air through saidcasing responsive to the temperature of the air in said room.

3. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing with an outside air inlet andan inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to said outletand through the corridor of the building to be conditioned, means withinsaid casing in the path of said air to condition said air to apredetermined dewpoint, a supplementary air conditioner comprising acasing with an air inlet in communication with said corridor containingconditioned air, an air outlet into the room to be conditioned, an airinlet in communication with said room, a mixing chamber, an airconditioning coil, means to circulate air from said inlets through themixing chamber and coil to said outlet, and means to regulate themixture of conditioned air and room air, responsive to the humidity ofthe air in the room. I

i. In an apparatus for air conditioning buildings, the combin tion of amain air conditioner comprising a casing with an outside air inlet andan inside air outlet communication with a corridor of the building to beconditioned, means to circulate air from said inlet to said outlet andthrough the corridor of the building to be conditioned, means withinsaid casing in the path of said air to condition said air to apredetermined dewpoint, a supplementary air conditioner comprising acasing with-an air inlet in communication with said corridor containingconditioned air, an air outlet into the room to be conditioned, an airinlet in communication with said room, a mixing chamber, an airconditioning coil, means to circulate air from saidinlets through themixing chamber and coil to said outlet, and means to regulate themixture of conditioned air and room air, responsive to the humidity ofthe air in the room, and means to regulate the flow of a refrigerant tosaid coil responsive to the dry bulb temperature of the room,

5. In an apparatus for air conditioning buildings, the combination of. amain air conditioner comprising a casing withfan outside air inlet andan inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to said outletand through the corridor of the building to be conditioned, means withinsaid casing in the path of said air to condition said air to apredetermined dewpoint,.a supplementaryair conditioner comprising acasing with an air inlet in communication with said corridor containingconditioned air, an air outlet into the room to be conditioned, an airinlet in communication with said room, a mixing chamber, an airconditioning coil, means to circulate air-from said inlet through themixing chamber and coil to said outlet, and means to regulate themixturesot conditioned air and room air, responsive-to the humidity ofthe air in the room, means to regulate the flow of a refrigerant to saidcoil responsive to the dry bulb temperature of the room, and meansresponsive to both the humidity and dry bulb temperature of the room tocontrol the air circulating means.

6. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing with an outside air inlet and 5an inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to said outletand through the corridor of the building. to be conditioned, meanswithin said casing in the path of 10.

said air to condition said air to a predetermined dewpoint, asupplementary air conditioner comprising a casing with an air inlet incommunication with said corridor containing conditioned air, an airoutlet into the room to be conditioned, an air inlet in communicationwith said room, a, mixing chamber, an air conditioning coil, means tocirculate air from said inlets through the mixing chamber and coil tosaid outlet, an interconnected damper at each of said inlets, a motoroperating said damper means responsive to humidity of room controllingthe operation of said damper.

7 In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casingwith an outside air inlet and aninside air outlet in communication with a corridor of the building to beconditioned, means to circulate air from said inlet to said outlet andthrough theccrridor of the building to be conditioned, means within saidcasing in the path of said air to condition said air toa predetermineddewpoint, a precooling coil in the path of said air between the inletand the main cooling coil, and

a reheating coil in the path of said air between the main cooling coiland .the air outlet, conduits carrying a heat exchange fluid and forminga circuit between said precooling coil and said reheating coil, andmeans to circulate said fluid, a supplementary air conditionercomprising a casing, an air inlet in communication with'said corridor,an air outlet into the room to be conditioned, means to circulateair'from said inlet to outlet, an air conditioning'coil in said casingin the path of said air, and means'to regulate the flow of refrigerantto said coil, said means being responsive to the temperature of the airin said room.

8. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing with an outside air inlet andan inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to saidoutlet andthrough the corridor of the building to be conditioned, means withinsaid casing in the path of said air to condition said air to apredetermined dewpoint, a precooling coil in the path of said airbetween the inlet and the main cooling coil, and a reheating coil in thepath'of said air between 0 the main coolingfcoil and the air outlet,conduits carrying a heat exchange fluid and forming a circuit betweensaid precooling coil and said reheating coil, and means to circulatesaid fluid, a supplementary air'conditioner comprising a casing 5 withan air inlet in communication with said corridor containing conditionedair, an air outlet into the room to be conditioned, an air inlet incommunication with said room, a mixing chamber, an air conditioningcoil, means to circulate air from said inlets through the mixing chamberand coil to said outlet, and means to regulate the mixture. ofconditioned air and room air, responsive to the humidity of the air inthe room.

9. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing with an outside air inlet andan inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to said outletand through the corridor of the building to-be condiitoned, means withinsaid casing in the path of said air to condition said air to apredetermined dewpoint, a precooling coil in the path of said airbetween the inlet and the 'main cooling coil, and a reheating coil inthe path of said air between the main cooling coil and the air outlet,conduits carrying a heat exchange fluid and forming a circuit betweensaid precooling coil and said reheating coil, and means to circulatesaid fluid, and means positioned between the main cooling coil andreheating coil to control the amount of refrigerant supplied to maincooling coil, a supplementary airconditioner comprising a casing with anair inlet in communication with said corridor containing conditionedair, an air outlet into the room to be conditioned, an air inlet incommunication with said room, a mixing chamber, an air conditioningcoil, means to circulate air'from said inlets through the mixing chamberand coil to said outlet, means to regulate the mixture of conditionedair and room air, responsive to the humidity of the air in the room, andmeans to regulate the flow of a refrigerant to said coil responsive tothe dry bulb temperature of the room.

10. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing with an outside air inlet andan inside air outlet in communication with a corridor of the building tobe conditioned, means to circulate air from said inlet to said outletand through the corridor of the building to be conditioned, meanswithinusaid casing in the path of said air to condition said air to apredetermined dewpoint, means to reheat said air substantially abovesaid dewpoint, a supplementary air conditioner comprising a casing, anair inlet in communication with said corridor, an air outlet into theroom to be conditioned, means to circulate air from said inlet tooutlet, an air conditioning coil in said casing in the path of the airto extract sensible heat therefrom, and means to regulate the flow ofrefrigerant to said coil, said means being responsive to the temperatureof air in such room.

11. In an apparatus for air conditioning buildings, the combination of amain air conditioner comprising a casing. with an outside air inlet andan inside air outlet in communication with a conduit in the building tobe conditioned, means to circulate air-from said inlet to said outletand through said conduit, means within said casing in the path of theair to condition it to a predetermined dewpoint, a supplementary airconditioner comprising a casing, an air inlet in communication with saidconduit, an air outlet into the room to be conditioned, means tocirculate air from said inlet to outlet, an air conditioning coil insaid casing in the path of such air, and means to regulate the flow ofair through said casing responsive to the temperature of the air in saidroom.

' REUBEN H. ANDEREGG.

